FC1500-ULNplus

Ultra Low Noise Optical Frequency Combfor Optical Lattice Clocks

NEWK E Y S P E C I F I C AT I O N S■ Comb Spacing 250 MHz■ Accuracy 1 x 10-18 (t >100 s)■ Stability: 5 x 10-18 in 1 s, 5 x 10-19 in 1000 s■ Operational Range from 500 nm to 2 µm
■ Integrated Phase Noise <80 mrad
[1Hz-2 MHz]A P P L I C AT I O N S■ Optical (Lattice) Clocks■ Clock comparisons (via fiber networks)■ Transfer of CW Laser Stability to Full
Comb Spectrum from 500 nm to 2 µm

The FC1500-ULNplus Ultra Low Noise Optical Frequency Comb brings the system
performance to the next level. Additional hardware, optimized components and engineering ingenuity resulted in a perfect flywheel for transferring frequency stability
between two or more user-defined frequencies at the 10-19 level. This exceeds thestability of any optical oscillator demonstrated to date, and transcends the stability
requirement for optical clocks.
The ability to measure sub-10−18 level frequency shifts can be relevant for applications such as optical clocks in quantum sensing and fundamental physics. Our
all polarization maintaining figure 9® mode locking technology together with highbandwidth actuators (>1 MHz) for both the carrier-envelope offset frequency and therepetition rate guarantee ultimate performance.
The performance is proven in an out of loop comparison between two independent
ULNplus optical frequency combs, which is integral part of the quality check during
factory acceptance of each system. Thus Menlo guarantees and proves by measurement that the outstanding spectral purity of the oscillator is transferred perfectly tothe desired wavelength for every system delivered.
Phase Noise of Comb-Comb Comparison at 698 nm
Analysis of the out of loop beat signal between two ULNplus combs at
the Strontium clock transition frequency:
The extremely low phase noise
proves that the spectral purity istransferred to the target wavelength,
which makes the ULNplus a uniqueclockwork for Strontium and otheroptical lattice clocks.

F E AT U R E S■ High Repetition Rate
■ High Bandwidth >1 MHz Actuators for
CEO and Repetition Rate

■ Fully stabilized and qualified HMP-VIS/NIRat custom wavelength (500 nm to 2 µm)■ Turnkey Metrology System. Fully automated,including data evaluation software, designed
for continuous operation

OPTIONS
Complete Solution with Modular
Extensions
Menlo Systems Optical Frequency Combs
are complete solutions. The modular systemarchitecture allows for easy additions ofmore functionality to an existing system.
Multiple extensions can be combined in asystem.

■ M-Mid-IR: Extension Package■ M-NIR: Extension Package■ M-VIS: Extension Package■ HMP: High Power Measuring Port■ P250 PM Pulse EDFA:
Erbium-doped Fiber Amplifier■ M-780: High Power output around 780 nm■ BDU: Beat Detection Unit
■ LLE-SYNCRO: Laser Locking Electronics■ Microwave: Ultrastable RF Output■ GPS: -based 10 MHz Frequency Reference■ WLM-NIR /WLM-VIS:
Integrated Wavelength Meters

Technology protected by patents US6785303, US6724788, US7026594, DE10044404, US7804863, US8995796, US8873601, JP4668423, JP5615397, CN103311780

﻿FC1500-ULN

plus

Ultra Low Noise Optical Frequency Comb for Optical Lattice Clocks
S P E C I F I C AT I O N S
Comb Spacing
Accuracy
Stabilityp
Integrated Phase Noise
LinewidthTuning Range of Spacing Between Individual Comb Lines
Tuning Range of CEO Frequency
Laser Outputs
Spectral Range
Average Output PowerCW Laser Inputs

F C 1 5 0 0 - U L N PLUS
250 MHz1 x 10-18 for t > 100s*
5 x 10-18 in 1s*r, 5 x 10-19 in 1000 s*r<80 mrad [1 Hz-2 MHz]
<1 Hz*t>4 MHz>250 MHz
five fiber-coupled, linearly polarized, PM output ports, 1560 nm>25 nm (500-1050 nm with M-VIS, 1050-2100 nm with M-NIR)>10 mW from each laser port (>100 mW with M-VIS, >200 mW with MNIR)
approx. 1 mW optical power required, wavelength user-defined in the 5002100 nm range (more upon request)

spectral purity transfer between fundamental and a user-defined wavelength in the 500-2100 nm range, *phase lock to optical reference, rmodified Allan deviation ( l-type counter, timebase1ms), tlimited by resolution bandwidth of analyzer

pREQUIREMENTS
Input Requirements
Operating Voltage
Frequency
Power Consumption
Cooling Requirements
Operating Temperature
Optical Unit Dimensions/WeightControl Electronics Dimensions/Weightcw optical reference, power level approx.1 mW (see Menlo ORS datasheet)
10 MHz frequency reference, power level +7 dBm
100/115/230 VAC
50 to 60 Hz<500 W, <3kW including chiller
closed cycle chiller included
22 ± 5 °C
706 x 716 mm, approx. 80 kg (Standard system configuration)
600 x 800 mm, approx. 140 kg (Standard system configuration)O R D E R I N G I N F O R M AT I O N
Product Code

FC1500-ULNplus

Please call for pricing. Specifications are subject to change without notice. Custom modifications are available, please inquire.
Invisible laser radiation
avoid exposure to beam
Class 4 laser

Menlo Systems GmbH
T+49 89 189 166 0sales@menlosystems.com

www.menlosystems.com

Menlo Systems US
T+1 303 635 6406
ussales@menlosystems.com

Menlo Systems Japan
T+81 907 409 20 21
jpsales@menlosystems.com

Menlo Systems China
T+86 21 6071 1678
chinasales@menlosystems.com

D-FC1500-ULNplus-EN 01/03/2024